Title: Investigating the current - potential difference relationship for a metal wire. Aim: To design an experiment that will facilitate an I - V Graph to be ascertained of a metal wire and thus find the resistance of the wire by deriving the inverse of the gradient of the graph. Skill: Planning & Designing Theory: Resistance is a property of any object or substance to resist or oppose the flow of an electrical current. The quantity of resistance in an electric circuit determines the amount of current flowing in the circuit for any given voltage applied to the circuit. This is according to Ohm's law. The unit of resistance is the Ohm which has the Greek letter 'Omega (Ω)'. By default, that is, for electrical calculations, the inverse of Resistance is obtained and this is known as conductance. If conductance is calculated by dividing current by potential difference then from the preceding phrase it can be deduced that, Resistance is calculated by ascertaining the inverse of conductance. The reasons for this will be provided within the Discussion/ Conclusion section. The resistance of an object is determined by the nature of the substance of which it is composed and this is known as the resistivity which are the dimensions of the object and the temperature. Resistance, however, is expressed in terms of the Ohm resistance per cubic centimeter at 20 oC (293 K). In its simplicity, before resistance is calculated, conductance is first obtained. Therefore: Current Conductance = Potential Difference Pooran (Rocky) Appadu Theory: Current -1 Resistance = Potential Difference Hypothesis: With reference to Ohm's law, by varying the potential difference (using the rheostat), the current will increase linearly for the metal wire thus allowing an I - V graph to be ascertained. By deriving the gradient of the graph, the conductance of the wire will be obtained and finding the inverse of conductance, the resistance of the wire will be ascertained. Apparatus: 1. Voltmeter 2....

...Aim:
The aim of this is to investigate how the length of a wire affects the resistance of it.
Theory
Resistance is a force, which opposes the flow of an electric current around a circuit so that energy is required to push the charged particles around the circuit. The circuit itself can resist the flow of particles if the wires are either very thin or very long. E.g. the filament across an electric bulb is quite thin as needs to resist the flow of...

...An experiment to investigate the factors which affect Resistance in a wire
What is resistance?
A potentialdifference (V) applied across a wire of length (l), there is in the conductor, an electric field (E). In this electric field the free electrons are not however under continuous acceleration (Ee/m). This is because they repeatedly collide with the moderately massive vibrating atoms losing their kinetic energy. The...

...the wire affects a current flowing through a wire. I know that as resistance changes, current changes, as Ohm's law:
I = V/R. If one part of an equation changes, the equal must be done to the opposite side. To detect how resistance affects current, I must first discover what factors affect resistance. These factors are:
· Length of the wire if a wire is longer; there are more particles for...

...Investigative Planning
The investigation that is going to take place is an investigation on the factors that affect the resistance in wires.
My aim is to investigate how different factors affect the resistance in a wire.
Some of the major factors that affect resistance in wires are: temperature, cross sectional area, material and length. These affect resistance in wires in different way’s e.g.
Temperature - Temperature...

...Planning:
Risk Assessment:
* I will handle the power supply carefully.
* I am going to only use a maximum voltage of 2 volts.
* I will be careful when handling the mains equipment.
* I will make sure I have a clear space to work in and nothing on the floor around me.
In this investigation, I will set up a simple circuit to be able to read the voltage and current when the length of wire changes, so I then can work out the resistance. I will be...

...PotentialDifference in Electrical Circuit
Discussion:
We conducted this experiment to test out the relationship of potentialdifferences and currents in series and parallel circuits. We were to indicate the special properties that the potentialdifferences and currents had with both types of circuits. In short, we were to test out Kirchhoff's...

...resistance of a wire is affected by the length of the wire.
Theory
What is resistance?
Resistance is a force which opposes the flow of an electric current around a circuit so that energy is required to push the charged particles around the circuit. The circuit itself can resist the flow of particles if the wires are either very thin or very long.
e.g. The filament across an electric light bulb.
How is it measured?
The...

...METHOD
 Set p the equipment as shown on the diagram.
 One meter length of wire is fixed to a one meter ruler.
 The first crocodile clip is clipped to the wire at the 0cm position on the one meter ruler.
 The second crocodile clip is clipped to the 10cm position.
 The power supply is turned on. The voltage and current are then read of the ammeter and voltmeter, and recorded.
 The power supply is...

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